“This relationship will take advantage of the combined strengths of two of North America’s largest and most innovative suppliers to the window and door industry," said Gus Coppola, president of Truseal and Besten, in the release. "Billco, established in 1948, has been making Besten washers for the past three years, and that relationship has proven beneficial to our mutual customers and both companies. This announcement expands upon that relationship and leverages the respective strengths of Truseal, Besten and Billco.” Billco is one of a list of worldwide equipment partners that works closely with Truseal, he said.